package cn.fan.study.first;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import lombok.extern.slf4j.Slf4j;

/**
 * 时间服务器客户端处理器
 *
 * @author HTHLKJ
 * @version 1.0
 * @date 2021/8/5 16:30
 */
@Slf4j
public class TimeClientHandler extends ChannelInboundHandlerAdapter {

    private final ByteBuf firstMessage;

    public TimeClientHandler() {
        byte[] req = "QUERY TIME ORDER".getBytes();
        firstMessage = Unpooled.buffer(req.length);
        firstMessage.writeBytes(req);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        //启动会将构造的消息发送给服务端
       ctx.writeAndFlush(firstMessage);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf=(ByteBuf) msg;
        byte[] req = new byte[buf.readableBytes()];
        buf.readBytes(req);
        String body = new String(req, "UTF-8");
        log.info("客户端接收：{}",body);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
//        释放资源
        log.warn("出错啦：{}",cause.getMessage());
        ctx.close();
    }
}
